Device for setting cutters.



W. H'. 0EH-LER.' DEVICE FOB SETTING GUTTBRS. APPLICATION mum AUG. 11,1909.

1,034,927. Patented'Aug. 6, 1912.

WITNESSES 33 INVENTUF? 444 %/%;mfl@%.

uugA-u BY W UNITED STATES PATENT OFFICE.

2 WILLIAM H. OEHLER, OF NEWARK, NEW JERSEY, ASSIGNOR T0 GOULD &EBEBHARDT,

OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DEVICE FOR SETTING CUTTERS.

Specification of Letters Patent.

Patented Aug. 6. 1912.

Application filed August 11, 1909. Serial No. 512,305.

T 0 all whom it may concern:

Be it known that I, WILLIAM H. OEHLER, a citizen of the United States,and a resident of Newark, in the county of Essex and State of NewJersey, have invented certain new and useful Improvements in Devices forSetting Cutters; and I do hereby declare the following specification,taken in connection with the drawings forming part of the same, to be afull, clear, and exact description of the principle of said inventionand the best mode in which I have contemplated applying that principle,so as to distinguish it from other inventions.

The invention relates primarily to machines employing a milling cutterand more particularly to gear cutting machines in which it is necessaryto set the milling cutter central with respect to a work-arbor.

Considerable trouble has been experienced heretofore, in providingproper means to set the hellcal cutters central with the workarbor,in'all the angular positions that said cutter may occupy with respect tosaid workarbor. In cutting gear-wheels, particularly by the bobbingmethod, it is essential to have a space or tooth of the helical cutterset exactly central with the gear being cut, so as to obtain symmetricalcurves on each side of the teeth of the gear.

i The object of the present invention is to provide a novel, simple andaccurate construction, whereby a space of the helical cutter, whenadjusted to any desired angular position, is readily and accurately setcentral with the work-arbor.

The invention comprises a sliding member having an end formed to fitbetween two teeth of the helical cutter and centrally located inrelation to the work-arbor and means to manually actuate said member atright angles to the center line of said helical cutter.

The annexed drawings and the following description set forth in detail,certain mechanism embodying means constituting however, but one of thevarious mechanical forms in which the principle of the invention may beused.

The drawings, illustrating the invention in its preferred form asapplied to a gear generating machine, show so much of a gearcuttingmachine as is necessary to properly illustrate the invention.

The novelty will be readily understood from the following detaileddescription and is more particularly pointed out in the claims.

Referring now to the drawings: Figure 1 is a plan View of acutter-carriage, partly in section and showing a section of thecutter'centering arrangement, at Y Y, of Fig. 2. Fig. 2 is an elevationof said cutter-carriage with the device for setting the cutter insection at X X of Fig. 1. Fig. 3 is a perspective view, partly insection, of the formed cutter gage and the s indle therefor.

Referrin now to the drawings the helicalcutter (1) 1s keyed to thecutter-spindle and clamped thereto by means of the bush (3) and nut (4).The cutter-spindle (2) is rotatably mounted in a lon itudinallyadjustable bearing (5) mounte upon the angularly adjustable slide (6).An end hearing (7) is provided, upon said slide (6), to support theouter end of the cutter spindle (2). Both cutter-spindle bearings (5)and (7) are arranged to slide on the angularly adjustable slide (6) andare guided by a tongue (8) fitting a groove in each. T bolts (9) areprovided in each of said bearings to clamp them securely to the slide(6) in its rotary movement, when properly adjusted.

The angularly adjustable slide ((3) is mounted upon the cutter-carriage(10) which is arranged to reciprocate upon the guideways of the mainframe (11) and held to said frame by the gib (12) and straps (13). Thecutter-carriage (10) is actuated by a feed screw (24) engaging athreaded portion therein and the screw (24) is connected to a suitablefeeding mechanism not shown.

Circular T-shaped grooves (14) are formed within the carriage (10) intoone of which a circular ton as (15), on the slide (6) is extended to orma guide for said slide (6). T bolts (16) are provided in each of saidrooves to securely clamp the slide (6) to the carriage (10) when in anydesired angular position.

The helical cutter (1) is rotated by the gear (17) in engagement withthe pinion (18) which is rotatably mounted in the slide 6) and rotatedby the bevel gears 19), 20)., (21) and (22) forming a central rivingarrangement to rotate the cutter when adjusted to any angular position.The bevel gear (19) is splined to the vertical cutter drive shaft (23)which is connected to any suitable source of power.

The cutter spindle 2 is connected to the gear 17 by the slidable center25, keyed to said spindle and held thereto from endwise movement by thenut 26, and slidably keyed to said gear 17 by the keys 27 provided onthe outer periphery thereof, whereby said cutter spindle 2 is adjustedendwise through the gear 17 without destroying the drivin connectiontherewith. The gear 17 is held from moving endwise by the cap 28 securedto the slide 6, and the ring 29 bolted to said cap 28.

To adjust the helical cutter 1 in an axial direction, an adjusting screw30 is provided with the head thereof arranged between two abutments 31on the spindle bearing 5, and the threaded end engaging with a tappedprojection 32 on the slide 6. To ad ust the cutter in the direction ofits axis, the bolts 9 in the bearing 5 are released and the bearingspindle and cutter are adjusted in either direction by simply turnin thead- 'usting screw 30, and when so ad usted the caring 5 is againsecurely clamped to the slide 6 by tightening the bolts 9.

The device for setting a s ace of the cutter 1 central, with the axis oft e gear to be cut or with the work arbor, is arranged in the center ofthe slide 6 so as to always remain central regardless of the angularposition of the axis of the cutter with the work arbor. The deviceconsists of a spindle 33 arranged to slide perpendicular to the axis ofthe cutter and keyed within the center of the angularly adjustable slide6. One side of said spindle 33 is provided with'rack teeth to be engagedby a pinon 34: rotatably mounted at right angles to said spindle andheld Within the slide 6 by the screw 38. The pinion 34 extends outwardthrough the slide 6, and is provided with a knurled knob 35 by means ofwhich said pinion 34 is rotated and said spindle 33, moved toward oraway from the cutter 1. The spindle 33 is provided with a taper hole,into which a gage 36 is arranged to fit. The gage 36 is flat on the oneend and formed to the'shape of a space between two teeth ofthe cutter,which is usually a rack tooth. Two projections 37 are arranged on thefiat end of the gage 36 to fit into a groove cut across the spindle 33,whereby the flat portion of the gage 33 is always held in a laneparallel with the axis of the cutter. 5 pin 39 is secured in the bevelgear 21 to form an ejector for the gage 36, whereby the gage 36 isreadily removed, when the spindle 33 is brought into the extreme rearposition. The gage 36 and spindle 33 are preferably made separate to alow the use of different shaped gages or of the work arbor, the cutterand spindle bcaring, 5, are adjusted longitudinally upon the slide 6 bymeans of the adjusting screw 30 until thegage 36 when brought in contactwith the cutter by means of the pinion 34, fits exactly into a space ofthe cutter. The spindle bearing 5 is then secured to the slide 6 by theT bolts 9 and the gage is withdrawn. If a new gage is to be substituted,the cutter must be removed and the gage ejected by moving the sameagainst the ejecting pin 39. By means of the device described, a spaceof the helical cutter is readily located centrally with relation to thework arbor when said cutter occupies any angular position for cuttingeither spur or helical gears. Said device can also be used to set a diskcutter by altering the form of the gage to an inverted V.

Having described my invention and its mode of operation, I claim as newand desire to secure by Letters Patent:

1. The combination with a cutter, of a support therefor, a spindleslidably mounted in said support and adjustable toward and from saidcutter, a gage in said spindle to locate said cutterand means' in saidsup port to eject said gage by adjusting said spindle.

2. The combination with a cutter, of a support therefor, a spindleslidably mounted in said support and adjustable toward and from saidcutter, a transverse groove in said spindle and in the same plane withthe axis of said cutter, and a gage in said spindle with projections toengage said groove whereby said gage is maintained in the same planewith the axis of said cutter.

3. The combination with a reciprocatory slide, of an angularlyadjustable carriage, a cutter shaft rotatably mounted in said carriageand adjustable axially, a spindle slidably mounted in said carriage andadjustable toward and from said cutter, a gage in said spindle to locatesaid cutter axes, said gage and cutter arranged in substantially thesame plane and means in said slide to eject said gage by adjusting saidspindle.

4. The combination with a reciprocatory slide, of a stud rotatablymounted thereon, a carriage mounted upon said slide and angularlyadjustable about said stud, a cutter shaft rotatably mounted in saidcarriage, and longitudinally adjustable thereon, a cutter securedthereto, a spindle mounted in said carriage, and adjustable toward andfrom said cutter, a gage in said spindle to locate said cutter, anejectin pin in said stud to eject said gage by a justing said spindle.

5. The-combination with a reciprocatory slide, of an angularlyadjustable carriage, a cutter shaft rotatably mounted in said carriageand longitudinally adjustable thereon, a cutter secured thereto, aspindle mounted in said carriage, the axis whereof is in the same planewith the cutter axis, means rovided in said carriage to adjust saidspindle toward and away from said cutter, a gage in said spindle, andmeans to eject said gage by adjusting said spindle.

6. The combmation with a reciprocatoryslide, of an angularly adjustablecarriage, a cutter shaft rotatably mounted in said carriage andlongitudinally adjustable thereon, a cutter secured thereto having teethlongitudinally of the shaft, a spindle mounted in said carriage andadjustable toward and from said cutter and a gage shaped to fitbetweentwo teeth of said outter in said spindle to locate said cutterrelatively to said angularly adjust-able slide.

7. The combination with a cutter having teeth arranged longitudinallythereof, of a support therefor, a gage formed to fit between two teethof said cutter, in a plane passing t ough the axes of said cutter andgage, an said gage adapted to be ad usted toward and from said cutter,in said support, to locate said cutter with respect thereto.

8. The combination with a cutter, of a support therefor, a gage formedto fit the contour of said cutter in a plane passing through the axes ofsaid cutter and gage, and said gage adapted to be adjusted toward andfrom said cutter, in said support, to locate said cutter with respectthereto.

WILLIAM H. OEHLER. Witnesses:

Huoo W. JACOBSON, WM. F. ZIMMERMANN.

